docs: def generate_host_passthrough(self, vcpu_num):
          """
          Generate host-passthrough XML cpu node
  
          Args:
              vcpu_num(str): number of virtual CPUs
  
          Returns:
              lxml.etree.Element: CPU XML node
          """
  
          cpu = ET.Element('cpu', mode='host-passthrough')
          cpu.append(self.generate_topology(vcpu_num))
          if vcpu_num > 1:
              cpu.append(self.generate_numa(vcpu_num))
          return cpu